US 12,378,466 B2
Electrochromic display element and method for producing electrochromic display element
Naoki Ura, Kanagawa (JP); and Hiroyuki Takahashi, Kanagawa (JP)
Assigned to Ricoh Company. Ltd., Tokyo (JP)
Filed by Naoki Ura, Kanagawa (JP); and Hiroyuki Takahashi, Kanagawa (JP)
Filed on Mar. 14, 2022, as Appl. No. 17/693,781.
Claims priority of application No. 2021-048596 (JP), filed on Mar. 23, 2021.
Prior Publication US 2022/0315830 A1, Oct. 6, 2022
Int. Cl. G02F 1/155 (2006.01); C09K 9/02 (2006.01); G02F 1/1516 (2019.01); G02F 1/1523 (2019.01)
CPC C09K 9/02 (2013.01) [G02F 1/15165 (2019.01); G02F 1/1523 (2013.01); G02F 1/155 (2013.01); C09K 2211/1018 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An electrochromic display element comprising:
a first substrate;
a first electrode over the first substrate;
a first electrochromic layer over the first electrode;
an electrolyte layer over the first electrochromic layer;
a second electrode over the electrolyte layer; and
a second substrate over the second electrode,
wherein the first electrochromic layer contains tin oxide having an average primary particle diameter of 3 nm or greater but 8 nm or less and an electrochromic compound containing a functional group bindable to the tin oxide,
wherein the first electrochromic layer does not contain titanium oxide, and
an amount by mole of the electrochromic compound per area of the first electrochromic layer is from 2.0×10−8 mol/cm2 through 2.0×10−7 mol/cm2.